A fine used 1d Black from Plate 6 lettered KF - full description below. A fine used 1840 1d Black from Plate 6, lettered KF with four margins and a fine red-orange maltese cross, being in STATE ONE. Many more interesting items over the next few weeks. Come see us at a Fair - check out our dates above and on our site.And enter the search term in the box, or use the index on the HOME PAGE. Members of the Philatelic Traders Society (PTS). Great Britain Philatelic Society (GBPS). The item "1840 1d Black Plate 6 KF 4m STATE ONE Fine Used Red Maltese Cross Cat. £375.00" is in sale since Tuesday, October 30, 2018. This item is in the category "Stamps\Great Britain\Victoria\Penny Blacks". The seller is "pennyblack1" and is located in Dorset. This item can be shipped worldwide.